Each time, lost air pressure in tire. Put air in, lost it again. Took car to tire repair shop and they told me about the cracks. You won't know until you have a problem. Just imagine if you drive "the ultimate driving machine" on a winding road, above the speed limit as some of us are known to do, on a wheel with a crack in it like the pic above, that you have no idea about. Might be a safety issue, right?